Table 1.

Relationships between Pit-1 and prolactin expression in 94 human breast invasive ductal carcinomas

	Prolactin
Pit-1	0	1+	2+	3+	Total cases
0	12	0	1	0	13
1+	4	27	2	0	33
2+	5	14	20	1	40
3+	0	5	2	1	8
Total cases	21	46	25	2	94

Intensity of staining: 0, not staining; 1, weak; 2, moderate; 3, intense. χ²=69.36; P<0.0001.